Mount for focus finders in signal lamps



May 6, 11930 D. J. M CARTHY 1,755,948

MOUNT FOR FOG-US FINDERS I-N SIGNAL LAMPS Fild Nov 14, 1927 lza/zzlr Patented May 6, 1930 UNITED, STATES A PATENT o15'F1cEi-.

DANIEL J. MCCARTHY, or ELGIN, ILLINOIS, Ass'IsNoR 'ro CHICAGO RAI WA sIGNAL & sUrPLY ooMPANY, or Nois CARPENTERSVILLE, ILLINOIS, A CQRZPORATIONi OF ILLI- MOUNT ron'roous FINDER-silt sIeNAL LAMPS Application filed November 14, 1927. sen-aim. 232,981.

The invention will be explained as applied to signal lamps wherein it is utilized for correctly positioning a focus finder upon a signal lamp unit with which' the mount be comes a permanent part, whereby to correctly determine the position of a source of cember 1, 1925, I have disclosed a mount for I a focus finder and have shown one means or similar parts.

mount for attaching the aforesaid finder to the unit lamp.

' The instant inventionis concerned solely with a mount by means off-which the finder may invariably be placed and located-in a .very definite position with respect to the focus of the lens or doublet lens of the unit. One of the objects of the invention is to improve the construction of mounts, upon which temporarily applied focus finding devices n ay'be supported, invariably in the same location with respect to the focus point of a lens, or reflector, of a signal light unit.

Other objects, advantages, and benefits of my invention will readily occur to persons skilled in the art, from a consideration of the following description when taken with the accompanying drawings, forming a part hereof, wherein: Y

Figure 1 is a side elevation of a signal unit. with a focus finder mounted thereon.

Figure 2 is a perspective view of apart of the focus finder having elements of the improved mount herein disclosed. Figure'3 is a section of parts of the mount, assembled.

Figure 4 is a perspective view of parts of the mount, separated and in position for assembling. In all ofthe views the same ref-. erence characters are employed to indicate The focusfinder 5 is separable from the lamp unit '6 and may be used for determin-- ing the correct location of the lamp 7 with respect to the axial focus of the lens 8 and. 9,

or either of them, units.

- ure 3.-

,holes .14'-14 and 15 in the positions of the lamp? and forliifing it v in selectde position, which position is to be I determined by the focus finderl'n 1 p This mechanism '10is fully described and claimed in my co pending application, Serial No. 282,980 filed of even date herewith,

The parts of the mount to bepermanently attached to the lamp unit andtorbcome an inseparable partthereof are individually shown in Figure 4 and as' assembled in Fig- Aiplate 11 has twospaced,parallel-studs -12, 12 which are to enter suitahle"perforations in a pair of perforated,' spaced ears 13-13 extending from the unit 6, o'nlyon'e said ear being shown. The plate lllia'st-hree relatively large perforations 14E14 and a;

central perforation '15.

A plate 16 hasthree'holesorperforations 17-17 and 18 which are'smaller than the axially, register therewith. 5

plate 11, but they Plate 16 also has two tapered depressions or counter sunk holes 1.8 18. The finder 5 has two tapered, projecting ,studs 1919 which exactly register :withthe depressions 4 B -18 A screw plate 20 has three spaced,

shown in Figure 2. This center screw holds the finder on the mount.

In the use and operation of the device the mount parts loosely assembled, shown in Figure 3, are attachedto' unit 6 by entering the studs 1212 into the reamed openings in the ears 13-13. The studs may betemporarily fixed by use of the setscrews 24-24.,

The finder 5 is now placed on -the mount with the'tapered studs 19- 19 entered indepressions 18* 18"- in plate 16 offthe mount: Screw 23'is now slightly tightened;

As the holes 1 1-147- 15 are considerably larger in diameter than the respective screws 222223, the plate 16 with the finder attached thereto andthe screw plate 20 may be shifted in any direction until the finder '5 locates lamp 7, with its filament at the focal I point of the lens doublet.

.The lamp 7 may be moved-to the location determined by the finder 5, by'means of the finder indicates when theproper position has been found, whereupon set screws 24 are tightened and thereupon dowel pins may be driven through the ears 13 and studs 12 to make the ascertained position permanent;

When a new lamp has been placed in the lamp holder 25; it maybe moved by the ad- -just1ng device 10 to any point within the range of said device, and the finder 5 being replaced in the mount will clearly indicate when the filament of the substituted lamp is at the focal. point of the'lenses.

I' am aware that many changes may be made and numerous details of construction may be varied through a wide range without departing from the principles of this invention and I, therefore do not purpose limiting the patent "granted necessitated by the prior art.

I claim as my invention:

1. A mount fora focus finder, on a lamp has been found, a

unit, a plate, plate supporting means on the unit, means on. the plate registerin in the plate supporting means topermit ore and aft motion of the plateand arra-ngedat the same time to prevent lateral motion thereof, a plate, means permitting the shifting of the second'plate on the first named plate to selected position thereon, the shiftable plate having depressions formed therein, means to lock said plates together when said position ocusfinder having a pair of tapering studs projecting therefrom to register in the depressions in the shiftable plate,

and means to secure said finder on said shiftable plate. f

-In testimony whereof I have hereunto subscribed my name.

DANIEL J. MCCARTHY.

hereon otherwise than 7 unit, a'plate, plate supporting means on thef unit, means on the plate registerin in the plate supporting means to permit ore and aft motion of the plate and arranged at the same line to prevent lateral motion thereof, a plate, means permitting the shifting of. the second plate on the first named plate to selected position thereon, means to lock said plates together when said posit-ion has been found, a focus finder,- registering means between said 'finder and said shiftable plate, andmeans to'secure said finder on said shiftable plate.

2. A mount for a focus finder, on a lamp unit, a plate having a pair of rearwardly extending parallel studs, apertured supports on the unit to receive the parallel studs to support the plate and permit fore and aft motion of the plate and at the same time to prevent lateral motion thereof, a plate, means permitting the shifting of the second plate on the first named plate to selected position thereon, means to lock said plates together when said position has been found, a focus finder, registering means between said finder and said shiftable plate, and means to secure said finder on said shiftable plate.

3. A mount for a focusfinder, on a lamp 

